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attent fitte onu/*En n. PILLA-nn, or New" sinensis,v CONNECTICUT, .issieNonro' ennesimo n. NORTH, crime sinn PLAGE'.

'Letters Patent No.` 75,967, dated llfar'ch 24, 1868.

IMPROVEMENT IN PBRMU'IATIONFLOCKS.

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T() ALLHWHOM IT MAYCONCERN: A I,

De it' known that I, OLIVER E. PILLARD, of New Britain, in thc county of Hartford, and State of Connectient, have invented, made, und applied tousc c certain new and useful Improvement in Locks; and I do hereby declare thefollowing to be u full, clear, und exact description ofthe scid invention, reference being had to the annexed drowing,lmnking part of this specification, whereinl Figure 1 is an elevation of the lock, the cap-plate being removed and the bolt projected.

Figure 2 is o similar view, with thc bolt retracted. (In bo/th'thcse iignrcs the circular tumblcrs are removed and their positions indicated by red lines.) Figure' is a vertical section through the spindle and tumblers.

Similar marks of reference denote the some parts.

My invention relates to devices applied to that class of locks in which a. series of circular tumblers is employed, ond-brought successively to place by a knob und spindlo that nrc turned .to points indicated by a. dial.

u My particular feature of invention relates to on improvement in the spindle, whereby the introduction of powder into the lock, or the forcing back of the spindle, is prevented iu cases ywhere'the knob is wrenched o; also to u'peculiarty in the construction of the dog, so that it'is held entirely out of contact with the tumbiers while they are being djusted, thereby cffectually preventing the position of the notch in the tumbler being dis? covered by friction or sound when the arm of the tumbler is in contact with the edges oi' the circular tumblers, as heretofore usual. And I combine therewith a device forpreventing the spindle being moved into contact with the tumblers until the bolt is fully projected.

In the drawing, d is the lock-case, b the-cap plate@ the bolt, of uny desired size or character; e is the dog on the centre-studf;l g is a lever und roller, acted upon by u spring, to give suicient pressure to the holt to cause the friction to hold the bolt, and not ollow'end-plcy thereto accidentally by the weight of the `holt if exposed to vibration or jar. h is the spindle, to which the knob k is attached, around the base of which are divisions, forming, with the stationary circular tiange Z, the index or dial by which the positions are indicated for setting the tumblers.

Thisspindle k is formed with a. neck or recess at t', so that this will be the weakest part ofthe spindle, and said spindle will breuk`ot this port (if the knob is wrcnched or hammered in endeavoring to force open the lock) before the other ports of the spindle will be materially injured; thereby the hub n, nt the end of said spindle, will remain in pince, to prevent the spindle being drown out, andthe spindle ,cannot be grasped with tools to pry' it`out, because it 'does not project from the door; and if an cicrt is mede to drive the spindle in, the shoulder e comes in contact with the bottom of the largo part of hole in the door through which the spindle posses; thereby fthe spindle cannot be driven in or the lock forced oil" by bnrglars, and hence the parts that secure the bolt remain uninjured.

The tumblers m are circular, and notched, and nre set by the pin 3 on the hub u. These tumblers being of any ordinary construction, do not require further description.

The bolt c has on it a stud, 4, that, when the bolt is nearly projected, comes into contact with an incline, 5, rnising the dog e, and sustaining it in the position shown in Iig. 1, with its arm, G, above and entirely clear of the circular tumblers m; hence these tumblers must be setby the dial alone, and there is nothing in contact with their periphery that can hecone :in indication of the location of the notches.

I I provide an ovcrhunging flange or plate, that is lower thun the under side of the bolt, near the talon, as seen nl: 7, which passes down in front of the hub n, to keep that hub from being pushed back into contact with the tnmblers, except when the bolt is wholly projected, n notch nt 8 being provided in this ilenge or plate, to allow said hub to he pressed back toY the tumhlers when the bolt is fully thrown.

l lly this construction it is impossible to open the lock by the aid of the friction or the sound, or if' an effort is made to bring the arm 6 into contact with the tumblers by en end-motion of the bolt, (between the end of the dog e and the studr9,) the not of moving the holt would prevent the hub n being drawn back 'if the hub passed entirely beyond the plate orjiange 7, but 'l'. prefer that the huh n remain within the curvednoteh 8 while acting upon.the tuniblers, and in that position entirely 4prevents motion to the bolt in either direction.

What I`olslm, anddesire to secure by Letters Patent, is- 'I The stud 4 on the bolt, in combination with the dog e, for raising antl holding` np said dog an1l`its arm clear ofthe tumblers when the bolt is projected.

In witness whereof, I have hereunto set my signature, this thirteenth day of July, 1867.

' OLIVER E.-1 1LLARD.

Witnesses:

CHA's. H. Smm,

GEO. D. WALIER. 

